Instructions

Preheat oven to 375F.

Butter a 10-inch cast-iron skillet and sprinkle with the 1 tablespoon sugar. Place grapes in pan.

Place eggs, remaining 1/3 cup sugar, vanilla, salt, orange rind, flour and milk in a blender and blend until smooth. Pour over grapes. Bake 35 minutes, or until golden brown and puffy. Cool on wire rack until warm. Sift powdered sugar over top before serving.